|
Author(s): |
Rundong Li, Institute of Clean Energy and Engineering and Liaoning Key Laboratory of Clean Energy Shenyang Aerospace University,Shenyang, China
Yun Zhao, Institute of Clean Energy and Engineering and Liaoning Key Laboratory of Clean Energy Shenyang Aerospace University,Shenyang, China
Shuang Wang, Institute of Clean Energy and Engineering and Liaoning Key Laboratory of Clean Energy Shenyang Aerospace University,Shenyang, China
Yanlong Li, Institute of Clean Energy and Engineering and Liaoning Key Laboratory of Clean Energy Shenyang Aerospace University,Shenyang, China
Yang Sun, Institute of Clean Energy and Engineering and Liaoning Key Laboratory of Clean Energy Shenyang Aerospace University,Shenyang, China |
|
Abstract: |
Ultrasonic pretreatment takes on unique advantages on the sludge drying because of its energy concentration, mighty penetrating capability and the ability of causing cavitations. The mechanical dewatering sludge (the water content is 84.7%) used in this study was obtained from a wastewater treatment plant in Shenyang. The sludge samples were compounded with different water content by adding water, then they were pretreated with different ultrasonic treatment time, different ultrasonic intensities. The effect of ultrasonic pretreatment on sewage sludge disintegration was discussed by analyzing the thermal drying characteristics and pH value of sludge. The results indicate that: ultrasonic pretreatment can improve the sludge drying efficiency by destroying the structure of sludge flocs and cells, and releasing the water and organic compound to liquid phase. The drying efficiency of sludge is highest when the water containing is 84.7%, the ultrasonic intensity is 3W/ml and the pretreatment time is 2 minutes. Furthermore, the pH of sludge will change accordingly after ultrasonic pretreatment.
|